>that means the packet will be sent during next frame instead?
No, the sh_schedule_trans() got preempted when a xferdone irq occurs (Kinda
like suspended/blocked), and will continue after the irq has been handled.
(kinda like resume)
>can we just change the hc_interrupt to
>
>if (.... && urb_state <= 0)
>{
> if (urb_state == 0) add_packet
> else schedule_trans
>
That is not totally correct, we can't really call sh_schedule_trans() again
in the xferdone because it would try to schedule to isochronous urb,
interrupt urb, control urb, and bulk urb again in that order. This would
violate the USB spec.
>
>Pei Liu wrote:
>>
>> >
>> >but i thought sh_done_list returns (urb_state = -1) if it is done???
>> >but in the hc_interrupt... it checks whether urb_state == 0... which
>> >means it would not try another packet???
>>
>> Yes, I think I understand your concern. The sh_done_list returns a -1
when
>> it has completed the URB, in such case, the hc_interrupt would not call
send
>> another packet. But you still have to remember in the sh_schedule_trans
>> routine, which initiated every SOF, would continue to call even after the
>> hc_interrupt returns. The sequence is like this
>>
>> -->sh_schedule_trans
>> ------>> scan_urb_list
>> ----------->> sh_add_packet()
>>
>> ->hc_interrupt ; interrupt occurred because xferdone irq. In this case,
the
>> sh_schedule_trans would be pre-empted
>> --->sh_done_list : take care of the xferdone irq
>> -------> sh_add_packet if urb_state >=0
>>
>> ......
>>
>> ->hc_interrupt ; interrupt occurred because xferdone irq.
>> --->sh_done_list : take care of the xferdone irq
>> ---> hc_interrupt exits when urb_state = -1;
>>
>> --> sh_schedules continues with the next urb after all irq has handled.
>>
>> Pei
>
>
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